Sewing machine attachment for sewing eye tape



Nov. 10,, 1931. D. SILBERMAN 1 1,830,917

SEWING MACHINE ATTACHMENT FOR SEWING EYE TAPE Original Filed Feb. 25.1929 2 Sheets-Sheet 1 m A1 VENTOR ATTORN Y Nov. 10, 1931. D. SILBERMANSEWING MACHINE ATTACHMENT FOR SEWING EYE TAPE 2 Sheets-Shea 2 OriginalFiled Feb. 25. 1929 Patented Nov. 10, 1931 UNITED TATES DAVID sILBnnMAN.or New YORK, a. Y.

SEWING MACHIN momma FOR s wING EYE TAPE Application filed February 25,1929 ,'S eria1 No. 342,565. Renewed September 25, 1981.

' of passing through the cloth, strikes the wire of which the eye ismade and is broken, bent or blunted, shutting down the sewing'machineuntil a new needle can be placed in the machine. This slows downproduction. Heretofore attempts have beenmade to provide sewing machinesused for this purpose with automatic stop devices which would stop thetapewith the eyes out of the path of the needle. Such devices have notbeen satisfactory because it is impossible to mathematically space theeyes on the stretchable tape to accurately co-operate with the stopmechanism. It is my object to provide an attachment which can be placedon a sewing machine which will always throw the wire clear of the needlepath as the latter pierces the cloth, regardless of the spacing of theeyes on the tape. I accomplish this by means of a continuously vibratingarm achacent the needle which engages the wire and throws it out of theneedle path.

In the drawings Fig. 1 is a top view of:

' my attachment;

Fig. 2 a sectional view of the structure of Fig. 1 on the line 22thereof; Fig. 3 a sectional View of the structure of Fig. 1 on the line33 thereof; Fig. 4 a sectional. view of the structure of Fig. 1 on theline 4-4 thereof; and Fig. 5 a sectional, detail view of the slidingpin' pivot used in the device. The attachment comprises a base plate 1having a post 2 on one side thereof. A second post 3 is located on theother side of the base plate. A post 4 alines with the post 2 4 and ashaft 5 is journalled in the posts 2 and 4. An arm 6 is pivoted on theshaft 5 and V has a slot 7 in its free end through which passes alocking bolt 8 which is secured to the post 3.

' A second arm 9 is pivoted on the other end of the shaft at the post4and'is fastened byalocking bolt 10 to a post, 11 on the base plate.Thelockin'g bolts, when loosened, per- Init a swinging motion of thearms 6 and 9 on the shaft 5.

A shaft 12 is journalled in the arms 6 and 9, as best shown in Fig. 1. Adrive gear 13 and a'pinion 14 are mounted on the arm6. The gear mesheswith a pinion 15 secured to the shaft '5 and thepinion 14 meshes with agear 16 on the shaft 12, a slot 17 being out in the base plate to giveclearance for the gears. The gearing is such that the shaft 5'turns sixtimesto one turn of the shaft12.

The posts 4 and 11 are extended attheir bases to. form a face block 18.This block has a guideway secured to it consisting of a pair of plates1919 having a central pocket 20. A recess 21 is cut through the wall ofthe part 19 and partly through the wall of the part 19, as best shown inFig. 5. The pocket 20 is cut through to the top of the parts 1919 asbestshownyin Fig. 3 and a slot 23 is cut through both parts, 19 19 atthe rear.

The shaft 5 has an eccentric pin 5 on its end which enters into thepocket 20. The slot 23 has a pin 24"with flattened ends slidab-letherein as best shown in Figs. 3 and 5. A vibrator arm 25 is pivoted onthe pin 24 and .isprovided with a rectangular hole 26. A slide block 27with bosses 27 27 rides in the rectangular hole 26 and has a centralbearing which receives the eccentric pin 5. The revolution of the'pin 5'causes the arm 25 to slidebackwards and forwards as the shaft 5revolves, the pivot pin 24 sliding in the slot 23.

v The shaft 12 ;has an eccentric pin 12 on itsend which engages a link28. The other end of the link is pivotally secured to the arm 25. As theshaft 12 revolves the eccentric pin 12 raises and lowers the link 28 andarm 25 at the same time the shaft 5 and pin 5 are moving the armbackwards and forwards. This results in the free endof the vibratorarmhaving a four way movement, up and down and backwards and forwards.

The free end of the arm 25 has a serrated piece 29 secured thereto, theattaching screws passing through enlarged holes therein for adjustmentpurposes.

In use the attachment is mounted on a sewing machine with the serratedpiece 29 adjacent the needle or, presser foot y; and feed dog (Z. Thearms 6 and 9 are adjusted until the serrated piece 29 is at the properheight over the table to strike the wire of an eye when in loweredposition. The serrated piece is adjusted longitudinally on the arm 25 sothat when the wire of an eye is in any serration the path ofthe needleon its down. stroke is out of the line of the wire.

The tape and the garment are fed to thepresser foot by any suitablemechanism and moved under the needle by the feed dog in the usualmanner. While the sewing machine is running the vibrator arm is rapidlyand continuously moving back and forth and more slowly up and down. Onthe down stroke the serrated edge hits the wire'of which the eye is madeand the backwards and for-' wards movement positively moves it out ofthe path of the needle as the latter makes its down stroke to form astitch. This action takes place regardless of the spacing of the eyes onthe tape so that one sewing machine may be used without change for tapeshaving the eyes at different distances from one another. 1 I have foundin practicethat the tape and wire eyes are so agitated by the rapidmovement of the vibrator arm that even if the needle'strikes the wire ofan eye the result of the collision of the two rapidly moving bodies isto cause them to glance off each other without breaking the needle.

By the use of this mechanism the speed of sewing is not reduced as thereis no possibility of broken needles due to collision with the wires ofthe eyes. l

I claim 1. In a feeding device for sewing machines,"a base plate, a pairof parallel shafts revolvably mounted thereon, a vibrator arm mountedadjacent to said shafts, means on one shaft engaging the vibrator armfor moving the same backwards and forwards, means on the other shaftengaging the vibrator arm for simultaneously moving the same up anddown, and a serrated plate on the free end of the arm adjacent themachine needle. 7

2. In a feeding device for sewing machines, a base plate, a pair ofparallel shafts revolvably mounted thereon, an eccentric pin on the endof each shaft, a block adjacent the shaft ends, a vibrator arm movableon said block and provided with an aperture therein, a block in saidaperture engaging the eccentric pin on one shaft, a link on the othereccentric pin of the other shaft connected with the vibrator arm and aserrated plate on the free end of the arm adjacent the machine needle.

3. A feeding device for sewing machines comprising a base plate, a pairof spaced arms pivotally secured to said plate, a pair of parallelshafts revolvably mounted on said arms, a vibrator arm mounted on saidbase plate, a serrated plate on the free end of said arm adjacent theneedle and means connecting said shaft and vibrator arm whereby thelatter is continuously moved forwards and backwards and up and down.

4. A feeding device for sewing machines comprising a base plate, a pairof parallel shafts revolvably mounted thereon, an eccentric pin on the'end of each shaft, a slotted bearing block on the base plate, avibrator arm provided with an opening therein, a slide block in one ofsaid openings engaging the eccentric pin on one of said shafts, a pin intheother of said openings engaging the slot in the bearing block, a linkengaging the eccentric on the other shaft and the vibrator arm and aserrated plate on the free end of the vibrator arm adjacent the needle.

5. Ina feeding device for sewing machines, a vibrator arm, aserratedplate on the free end thereof located adjacent tht machine needle, meansfor continuously vibrating said arm backwards and forwards at a higherrate than the up and down vibrations, whereby the serration will engagea Wire ,objectpassing under the needle and move the object out of thepath of the machine needle on the down stroke of the latter.

In testimony whereof I have afiixed my signature.

DAVID SILBERMAN.

